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Search: id:A113985
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| 1, 3, 7, 17, 45, 135, 463, 1817, 8121, 41075, 233471, 1480945, 10412589, 80634431, 683674831, 6312152353, 63144706753, 681317547507, 7896054343495, 97919789763073, 1294863406981789, 18200820837825479, 271147632138373599
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OFFSET
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0,2
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FORMULA
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a(n) = [A113983^2](n, 0) + [A113983^3](n-1, 0) = A113989(n) + A113994(n-1).
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PROGRAM
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(PARI) {a(n)=local(A, B); A=Mat(1); for(m=2, n+3, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3|j==1|j==i, B[i, j]=1, B[i, j]=A[i-1, j-1]+(A^2)[i-2, j-1]); )); A=B); A[n+3, 3]}
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CROSSREFS
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Cf. A113983, A113984 (column 1), A113986 (column 3), A113987 (column 4).
Adjacent sequences: A113982 A113983 A113984 this_sequence A113986 A113987 A113988
Sequence in context: A087953 A106191 A062810 this_sequence A071985 A090977 A014144
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Nov 12 2005
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